JP4381995B2 - Pipe propulsion embedding equipment - Google Patents

Description

  The present invention relates to a pipe propulsion embedding apparatus that propels and embeds a pipe in the ground without excavating the ground surface. More specifically, the present invention relates to an excessively large rotational drive unit of a propulsion unit when propelling a pilot pipe, an auger head, or the like. The present invention relates to a technique for preventing a propulsion reaction force from being applied and improving a propulsion force for integrally propelling a pilot pipe, an auger head and the like so as not to be insufficient.

  Conventionally, in order to embed water and sewer pipes, communication and electrical pipelines in the ground without excavating the ground surface, a propulsion burial method has been used in which pipes are laid in the horizontal direction from the inside of a shaft. (For example, see FIG. 2 of Patent Document 1 below).

At this time, in the so-called two-step type propulsion embedding method, first, the propulsion device 1 is installed inside the start pit A excavated from the ground surface G as shown in FIG.
The propulsion unit 1 is rotatably supported by a bearing 2 and is driven to rotate by a drive motor 3 and a speed reducer 4, and a propulsion plate reciprocated in the left-right direction by a large-diameter hydraulic cylinder 6. 7.
A small-diameter hydraulic cylinder 8 is interposed between the bearing 2, the drive motor 3, the speed reducer 4, and the rotation drive member 5 and the propulsion plate 7, and the pilot tube 9 connected to the rotation drive member 5 is integrally propelled. It can be done.

Next, the first pilot pipe 91 is connected to the rotary drive member 5 of the propulsion unit 1, and the pilot pipe 91 is rotationally driven by the drive motor 3 and the speed reducer 4, while the small diameter hydraulic cylinder 8 rotates the rotary drive member 5. The pilot pipe 91 is propelled and buried in the ground.
The pilot pipe 9 can be buried from the starting pit A to the reaching pit B by repeating the propulsion operation by connecting the next pilot pipe 92 to the rear end of the buried pilot pipe 91 and driving it in rotation. it can.

At this time, the position of the target 9a built in the tip portion of the pilot pipe 9 is measured by a measuring means (not shown) such as theodolite provided in the start shaft A, and the propulsion direction of the pilot pipe 9 is confirmed.
When the position of the pilot tube 9 is displaced, the rotation drive member 5 of the propulsion device 1 is rotated so that the inclined surface 9b of the pilot tube 9 faces the direction of displacement. Adjust the phase.
When the pilot tube 9 is propelled in this state, the tip inclined surface 9b of the pilot tube 9 bites into the ground, so that a radial correction force acts on the tip inclined surface 9b. Can be corrected.

When the embedding of the pilot pipe 9 is completed, the auger head 10 and the auger screw 11 are connected to the rear end of the buried pilot pipe 9 via a bearing 9c as shown in FIG. Is connected to the rotary drive member 5 of the propulsion unit 1.
Then, while rotating the auger head 10 and the auger screw 11 by the rotation drive member 5, the pilot pipe 9, the auger head 10 and the auger screw 11 are integrally propelled by the small diameter hydraulic cylinder 8, and the ground is excavated by the tip cutter 10a. .
At the same time, a propulsion machine is provided with a leading conduit 12 arranged around the auger head 10, a casing 13 for discharging excavated soil connected to the leading conduit 12, and a buried pipe 14 continuing to the rear end of the leading conduit 12. By integrally propelling with one propulsion plate 7 and the large-diameter hydraulic cylinder 6, a large number of buried pipes 14 can be buried sequentially while discharging excavated soil.

JP 2003-343194 A

By the way, in the conventional pipe embedment propulsion device 15 shown in FIGS. 5 and 6, the propulsion reaction force generated when propelling the pilot pipe 9, the auger head 10 and the auger screw 11 into the ground, respectively, The structure is such that it is received only by the rotational drive member 5.
For this reason, as shown by the arrow C in FIGS. 5 and 6, a strong ground clamping force acts on the pilot pipe 9, and a large excavation reaction force generated when the tip cutter 10a excavates the hard ground is auger head. When acting on 10, a large propulsion reaction force is applied to the rotary drive member 5, causing a problem of strength of the rotary drive member 5.

  Therefore, if the strength of the rotary drive member 5 is increased so as to withstand a large propulsion reaction force, the rotary drive member 5 is integrated with peripheral components such as the bearing 2, the drive motor 3, and the speed reducer 4. Therefore, when the rotary drive member 5 is enlarged, the peripheral parts are also large, and the propulsion device 1 becomes large.

Further, the rotary drive member 5 is connected to the propulsion plate 7 through a small-diameter hydraulic cylinder 8 and can integrally propel the pilot pipe 9, the auger head 10 and the auger screw 11.
However, the small-diameter hydraulic cylinder 8 is smaller in structure than the large-diameter hydraulic cylinder 6 that propels the propulsion plate 7, and is used to integrally propel the pilot tube 9, the auger head 10, and the auger screw 11. There was a case where the driving force was insufficient.

  Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, to prevent an excessive propulsion reaction force from being applied to the rotation drive portion of the propulsion device when propelling a pilot pipe, an auger head, etc. An object of the present invention is to provide an improved pipe propulsion embedding device so that the propulsive force for propelling a pilot pipe, an auger head and the like integrally is not insufficient.

The means described in claim 1 for solving the above problem is as follows.
A pipe propulsion embedding device that embeds a pilot pipe in the ground from the inside of a vertical shaft dug on the surface,
A propulsion unit installed in the shaft, having a rotation drive unit for rotating the pilot pipe and a propulsion unit for propelling the pilot pipe into the ground;
A connecting member connected to a rear end of the pilot pipe, rotated and driven integrally with the pilot pipe;
A thrust bearing interposed between the connection member and the propulsion unit, which transmits a propulsive force from the propulsion unit to the connection member while allowing relative rotation of the connection member with respect to the propulsion unit;
A rotational driving force transmitting means for transmitting a rotational driving force from the rotational driving unit to the connection member;
It is characterized by providing.

That is, in the pipe propulsion embedding device described in claim 1, after the pilot pipe is connected to the connection member, the connection member is driven to rotate by the propulsion unit while the connection member is driven to rotate by the rotation drive unit of the propulsion unit. By doing so, the pilot pipe can be propelled into the ground while being rotationally driven.
At this time, the propulsion reaction force acting on the connection member from the pilot pipe is received by the propulsion unit of the propulsion unit via the connection member and the thrust bearing, and therefore an excessive propulsion reaction force acts on the rotation drive unit of the propulsion unit. Can be prevented.
Further, since the propulsion unit of the propulsion unit can be configured separately from the rotation drive unit, sufficient strength and propulsion can be ensured, and the propulsion for propelling the pilot pipe is not insufficient.
Furthermore, since the connecting member, the thrust bearing, and the rotational driving force transmission means are added to the conventional propulsion device, the conventional propulsion device can be used as it is without modification.

Moreover, the means described in claim 2 is the pipe propulsion embedding device described in claim 1,
The rotational driving force transmitting means is an output shaft whose rear end is connected to the rotational driving unit,
The connecting member is integrally fixed to the front end of the output shaft,
The thrust bearing is held by the connecting member.

That is, the pipe propulsion embedding device described in claim 2 has a structure in which an output shaft provided with a connecting member and a thrust bearing is detachably attached to a conventional propulsion unit.
At this time, the output shaft can be easily attached to the propulsion unit by engaging the rear end of the output shaft with the rotation drive unit of the propulsion unit and attaching the thrust bearing to the propulsion plate of the propulsion unit.
The rear end of another pilot pipe propelled into the ground is connected to the front end of the output shaft.
Thereby, not only can the conventional propulsion unit be used without modification, but also the operation of sequentially propelling the pilot pipe into the ground can be easily performed as in the conventional case.

Moreover, the means described in claim 3 for solving the above-described problem is as follows.
A pipe propulsion embedding device that embeds a pipe by digging it into the ground from the inside of a vertical shaft dug on the surface,
A propulsion device installed in the shaft,
An auger screw having an auger head at its tip, which is connected to the rear end of a pilot pipe propelled in the ground by the propulsion unit and is integrally rotated by the rotation drive unit of the propulsion unit;
A cylindrical casing that is coaxially disposed around the auger screw and is propelled by a propulsion unit of the propulsion unit to discharge excavated soil excavated by the auger head;
A concentric pipe disposed at the front end of the casing and having a buried pipe continuous at the rear end;
The casing or the leading conduit allows the relative rotation of the auger head with respect to the casing and the leading conduit while transmitting the propulsive force received by the casing or the leading conduit from the propulsion unit of the propulsion device to the auger head. And a thrust bearing interposed between the auger head and
It is characterized by having.

That is, in the pipe propulsion embedding device according to claim 3, since the thrust bearing is interposed between the casing or the tip conduit and the auger head, the pilot tube, the auger head, the auger screw, the casing, the tip conduit and the buried tube. All of this can be propelled by the propulsion unit of the propulsion unit.
And the rotation drive part of a propulsion device plays only the role which rotationally drives an auger head and an auger screw.
Thus, an excessive reaction force in the propulsion direction that occurs when propelling the pilot pipe, the auger head, and the auger screw does not act on the rotation drive unit of the propulsion device.
Further, since the propulsion unit of the propulsion unit can be configured separately from the rotation drive unit, sufficient strength and propulsion can be ensured, and the propulsion for propelling the pilot pipe, auger head and auger screw is insufficient. There is nothing.

The means described in claim 4 is the pipe propulsion embedding device described in claim 3,
The thrust bearing is held by any of the auger head, the casing and the tip conduit;
And between the propulsion part of the said propulsion machine and the said rotational drive part, the pushing means for making the said auger head protrude in the propulsion direction front with respect to the said casing is interposed.

That is, in the pipe propulsion embedding device according to claim 4, even if the tip of the auger head is protruded from the tip of the tip conduit by using the pushing means as required when excavating the ground by the auger head, the thrust bearing Will not fall off.
If the auger head tip is housed inside the tip conduit using the pushing means, it is possible to return to a state where propulsive force is transmitted from the casing or tip conduit to the auger head via the thrust bearing.

According to the present invention, it is possible to reliably prevent an excessive propulsion reaction force from acting on a drive motor, a speed reducer, a bearing, a rotation drive member, and the like that constitute a rotation drive unit of the propulsion device.
In addition, the propulsion plate, connecting member, and casing that make up the propulsion unit of the propulsion unit can be made strong, and the hydraulic cylinder that makes up the propulsion unit can also be strengthened. Distance propulsion can be enabled.
In addition, thrust bearings, connecting members, and rotational drive force transmission means can be added to existing propulsion units, or the auger head, casing, or tip conduit can be modified, so existing propulsion units can be used without modification. Can do.
Also, even if a thrust bearing is provided in the auger head, the tip of the auger head protrudes from the front end of the front conduit as in the case of the conventional apparatus as necessary for ground excavation, and the conventional propulsion work is performed. be able to.

Hereinafter, with reference to FIG. 1 thru | or FIG. 4, each embodiment of the pipe | tube propulsion embedding apparatus which concerns on this invention is described in detail.
In the following description, the same reference numerals are used for the same parts including the above-described prior art, and a duplicate description is omitted.

1st Embodiment First, with reference to FIG. 1, the pipe | tube propulsion embedding apparatus used in the 1st process of the 2-step system pipe | tube propulsion embedding method mentioned above is demonstrated.

  This pipe propulsion embedding device 20 is for propelling and burying the pilot pipe 9 from the starting pit A excavated from the ground surface G to the reaching pit B. The connecting member 21 connected to the rear end and rotated and driven integrally with the pilot pipe 9 and the propulsive force from the propulsion plate 7 while allowing the relative rotation of the connecting member 21 with respect to the propulsion plate 7 of the propulsion machine 1 are allowed. A thrust bearing 22 interposed between the connecting member 21 and the propulsion plate 7 that transmits to the connecting member 21 and a rotational driving force that transmits the rotational driving force from the rotational driving member 5 of the propulsion device 1 to the connecting member 21. An output shaft 23 as a transmission means is added.

The connecting member 21 is a thick plate annular member, and is fitted and fixed to the front end portion of the output shaft 23 by welding, and an annular thrust bearing 22 is attached to the side surface facing the propulsion plate 7. Yes.
Thus, after appropriately setting the expansion / contraction length of the small-diameter hydraulic cylinder 8, when the rear end of the output shaft 23 is attached to the rotation drive member 5 of the propulsion unit 1 and the thrust bearing 22 is attached to the propulsion plate 7, the propulsion unit 1 The operation of propelling the pilot pipe 9 using can be started.

When the pilot tube 9 is propelled and embedded using the tube propulsion embedding device 20 of the first embodiment, the large-diameter hydraulic cylinder 6 is shortened and the propulsion plate 7 is fully retracted, and then the output shaft 23 The rear end of the first pilot pipe 91 that is first propelled and embedded is engaged with the front end 23a.
Then, the rotation drive member 5 is rotationally driven by the drive motor 3 and the speed reducer 4 of the propulsion device 1 to rotate the first pilot pipe 91.
Next, by gradually extending the large-diameter hydraulic cylinder 6, the first pilot pipe 91 can be propelled and buried in the ground.

When the embedding of the first pilot pipe 91 is completed, the large diameter hydraulic cylinder 6 is shortened and the propulsion plate 7 is fully retracted, and then the front end of the second pilot pipe 92 is connected to the rear end of the first pilot pipe 91. And the rear end of the second pilot pipe 92 is engaged with the front end 23 a of the output shaft 23.
The first and second pilot pipes 91 and 92 are integrally propelled by gradually expanding the large-diameter hydraulic cylinder 6 while the pilot pipes 91 and 92 are integrally rotated by the rotary drive member 5. Buried in the ground.
Thereafter, by repeating this operation, the pilot pipes 93, 94, 95 can be sequentially pushed and buried in the ground.

When the position of the pilot tube 9 is displaced, the rotation drive member 5 is rotated so that the tip inclined surface 9b of the pilot tube 9 faces the position displacement direction, and the rotational phase of the pilot tube 9 is adjusted. adjust.
In this state, when the large-diameter hydraulic cylinder 6 is extended to propel the pilot pipe 9, the tip inclined surface 9b of the pilot pipe 9 bites into the ground, so that the radial correction force acts on the tip inclined surface 9b. The positional deviation at the tip of the pilot tube 9 can be corrected.

That is, according to the pipe propulsion embedding device 20 of the first embodiment, after the rear end of the pilot pipe 9 to be buried is connected to the output shaft 23, the pilot pipe 9 is rotationally driven by the rotary drive member 5 of the propulsion unit 1. On the other hand, by pushing the connecting member 21 by the propulsion plate 7 of the propulsion device 1, the pilot pipe 9 can be propelled and buried in the ground while being rotated.
At this time, the propulsion reaction force acting on the output shaft 23 from the pilot pipe 9 is received by the propulsion plate 7 of the propulsion device 1 via the connection member 21 and the thrust bearing 22 which are integrally welded to the output shaft 23. The excessive driving reaction force does not act on the rotational drive member 5 of the propulsion device 1.

Further, the large-diameter hydraulic cylinder 6 and the propulsion plate 7 constituting the propulsion unit of the propulsion unit 1, the connecting member 21 and the thrust bearing 22 are a bearing 2 and a drive motor constituting the rotational drive unit of the propulsion unit 1. 3. Since it can comprise separately from the reduction gear 4 and the rotational drive member 5, sufficient intensity | strength and thrust can be ensured.
Thereby, the propulsive force for propelling the pilot pipe 9 is not insufficient.

Furthermore, since the pipe propulsion embedding device 20 of the first embodiment has a structure in which the connecting member 21, the thrust bearing 22 and the output shaft 23 are added to the conventional propulsion device 1, the conventional propulsion device 1 is not modified. Can be used.
In addition, the rear end of the output shaft 23 is engaged with the rotation drive member 5 of the propulsion device 1, and the thrust bearing 22 held by the connection member 21 is attached to the propulsion plate 7 of the propulsion device 1. Can be easily attached and detached.
Furthermore, when propelling the pilot pipe 9 into the ground, it is only necessary to engage the rear end of the pilot pipe 9 with the front end of the output shaft 23. It can be done easily.

In the pipe propulsion embedding device 20 of the first embodiment, the rear end of the pilot pipe 9 to be propulsion embedded is connected to the front end of the output shaft 23. It can also be set as the structure which connects directly to the connection member 21. FIG.
Further, by using one pilot pipe 9 as the output shaft 23, the present apparatus can be easily configured by diverting existing parts.

2nd Embodiment Next, with reference to FIGS. 2-4, the pipe | tube propulsion embedding apparatus used in the 2nd process of the 2-step system pipe | tube propulsion embedding mentioned above is demonstrated.

  This pipe propulsion embedding device 30 is used for sequentially propelling and burying the buried pipe 14 while using the pilot pipe 9 as a guide after the completion of the propulsion embedding of the pilot pipe 9 from the start pit A to the arrival mine B. An auger head 31, an auger screw 11, a leading conduit 32, a tip casing 33, and a thrust bearing 34 are combined with a propulsion device 1 installed in a starting pit A excavated from G.

The auger head 31 is connected to the rear end of the pilot pipe 9 that has been buried via a bearing 9c, and a large number of auger screws 11 are sequentially connected in series to the rear end.
The rear ends of the auger screws 11 connected in series with each other are connected to the rotation drive member 5 of the propulsion device 1.
As a result, the auger screw 11 and the auger head 31 can be integrally rotated and driven by the drive motor 3, the speed reducer 4 and the rotation drive member 5 of the propulsion unit 1. However, the pilot pipe is provided by interposing the bearing 9c. 9 does not rotate.

A cylindrical tip conduit 32 is coaxially disposed around the auger head 31.
A cylindrical tip casing 33 for discharging excavated soil excavated by the tip cutter 31 a of the auger head 31 is coaxially disposed around the auger screw 11.
Further, a direction correcting cylinder (not shown) is interposed between the front conduit 32 and the tip casing 33 so that the propulsion direction of the front conduit 32 can be adjusted.

In the initial state of the propulsion embedding operation shown in FIGS. 2 and 3, the rear ends of the leading conduit 32 and the tip casing 33 are in contact with the propulsion plate 7 of the propulsion unit 1, respectively, and the large-diameter hydraulic cylinder 6 is extended. By this, the leading conduit 32 and the tip casing 33 can be propelled together.
In the middle of the propulsion embedding operation shown in FIG. 4, the rear ends of the numerous embedded pipes 14 connected to the rear end of the leading conduit 32 and the numerous casings 13 connected to the rear end of the front casing 33. Are brought into contact with the propulsion plate 7 of the propulsion unit 1 and the large-diameter hydraulic cylinder 6 is extended, whereby the leading conduit 32, the buried pipe 14, the tip casing 33, and the casing 13 can be propelled together.

At this time, as shown in FIG. 4, a thrust bearing 34 is interposed between the annular support member 31 b provided coaxially on the rear outer peripheral portion of the auger head 31 and the front end portion 33 a of the tip casing 33. Has been.
As a result, the propulsive force received by the tip casing 33 from the propulsion plate 7 of the propulsion device 1 is transmitted to the auger head 31 via the thrust bearing 34.
At the same time, the auger head 31 can rotate relative to the leading conduit 32 and the tip casing 33 while receiving the propulsive force from the propulsion plate 7.

  The thrust bearing 34 is held by the front end portion 33 a of the tip casing 33, and the small diameter hydraulic cylinder 8 of the propulsion device 1 is shortened so that the tip cutter 31 a of the auger head 31 protrudes from the front end of the front conduit 32. Even so that it does not fall off.

  Next, with reference to FIGS. 2 to 4, a procedure for propelling and burying the buried pipe 14 using the pipe pushing and burying apparatus 30 of the second embodiment will be described.

As shown in FIG. 2, when the buried pipe 14 is propelled and buried using the pilot pipe 9 that has been buried as a guide, an auger head 31 is connected to the rear end of the pilot pipe 9 via a bearing 9c, The auger screw 11 of the minimum unit is connected to the rear end of the auger head 31, and the rear end of the auger screw 11 is connected to the rotation drive member 5 of the propulsion device 1.
Thereby, the auger head 31 and the auger screw 11 can be integrally rotated by the drive motor 3, the speed reducer 4, and the rotation drive member 5 of the propulsion unit 1.

At the same time, the leading conduit 32 and the tip casing 33 are disposed around the auger head 31 and the auger screw 11, and the rear ends thereof are brought into contact with the propulsion plate 7 of the propulsion device 1.
Thus, when the large-diameter hydraulic cylinder 6 of the propulsion unit 1 is extended and the propulsion plate 7 is pushed, the leading conduit 32, the tip casing 33, the thrust bearing 34, the auger head 31 and the auger screw 11 can be propelled together. it can.

  While excavating the ground with the tip cutter 31a of the auger head 31 and discharging the excavated soil with the auger screw 11 and the tip casing 33, the tip casing 33, the thrust bearing 34, the auger head 31, the auger screw 11, the tip conduit 32 and the buried By propelling the pipe 14 integrally, the buried pipe 14 can be buried in the ground with high accuracy using the pilot pipe 9 as a guide.

Next, after the large-diameter hydraulic cylinder 6 is shortened and the propulsion plate 7 is retracted, the front end of the next auger screw is connected to the rear end of the auger screw 11, and the next casing 13 is connected to the rear end of the front end casing 33. The embedded pipe 14 is connected to the rear end of the leading conduit 32.
The auger head 31 and the auger screw 11 are integrally rotated and driven by the rotation drive member 5 of the propulsion unit 1, and the leading conduit 32, the buried pipe 14, the tip casing 33, the casing 13, the thrust are driven by the propulsion plate 7 of the propulsion unit 1. By pushing the bearing 34, the auger head 31 and the auger screw 11 together, the buried pipe 14 can be pushed and buried.
The pilot pipe 9 pushed out to the reaching pit B along with the propulsion embedding of the buried pipe 14 is sequentially disassembled from the tip portion 91 and taken out to the ground.
Thus, the ground can be excavated while using the pilot pipe 9 as a guide, and the buried pipe 14 can be buried successively with high accuracy.

The auger head 31 can be protruded forward from the tip conduit 32 by shortening the small-diameter hydraulic cylinder (pushing means) 8 as necessary when excavating the ground with the tip cutter 31a of the auger screw 31.
At this time, since the thrust bearing 34 is held by the front end portion 33a of the front end casing 33, the thrust bearing 34 does not fall into the front conduit 32.
Then, when the small-diameter hydraulic cylinder 8 is extended and the tip cutter 31a is housed again in the leading conduit 32, the support portion 31b of the auger head 31 comes into close contact with the thrust bearing 34 again. Propulsion can be transmitted.

That is, in the tube propulsion embedding device 30 of the second embodiment, since the thrust bearing 34 is interposed between the auger head 31 and the tip casing 33, the pilot tube 9, the auger head 31, the auger screw 11, and the tip casing. 33, the casing 13, the leading conduit 32, and the buried pipe 14 can all be propelled by the propulsion plate 7 and the large-diameter hydraulic cylinder 6 of the propulsion device 1.
The rotation drive member 5 of the propulsion device 1 serves only to rotate the auger head 31 and the auger screw 11.
As a result, an excessive reaction force in the propulsion direction generated when propelling the pilot pipe 9, the auger head 31, and the auger screw 11 does not act on the rotation drive member 5 of the propulsion device 1.

Further, the large-diameter hydraulic cylinder 6 and the propulsion plate 7 that constitute the propulsion unit of the propulsion unit 1 are separated from the bearing 2, the drive motor 3, the reduction gear 4, and the rotation drive member 5 that constitute the rotation drive unit of the propulsion unit 1. Therefore, sufficient strength and driving force can be ensured.
Thereby, the propulsive force for propelling the pilot tube 9, the auger head 31, and the auger screw 11 is not insufficient.

Further, even if the small-diameter hydraulic cylinder 8 is shortened and the tip cutter 31a is protruded from the tip of the tip conduit 32 as required when excavating the ground with the tip cutter 31a of the auger head 31, the thrust bearing 34 falls off. There is nothing.
As a result, when the small diameter hydraulic cylinder 8 is extended and the tip cutter 31a is housed in the front conduit 32, the thrust force can be returned from the tip casing 33 to the auger head 31 via the thrust bearing 34. it can.

  In the pipe propulsion embedding device 30 of the second embodiment, a thrust bearing 34 is interposed between the auger head 31 and the tip casing 33, but the thrust is interposed between the auger head 31 and the leading conduit 32. Even if the bearing 34 is interposed, the same effect can be obtained.

As mentioned above, although each embodiment of the pipe | tube propulsion embedding apparatus which concerns on this invention was described in detail, it cannot be overemphasized that this invention is not limited by embodiment mentioned above and a various change is possible.
For example, although ball bearings are used as the thrust bearings 22 and 34 in the above-described embodiments, sliding bearings can be used in addition to roller bearings and tapered roller bearings.

The longitudinal cross-sectional view which shows the state which carries out the propulsion embedding of a pilot pipe with the pipe propulsion embedding apparatus of 1st Embodiment. The longitudinal cross-sectional view which shows the state which connected the pipe | tube propulsion embedding apparatus of 2nd Embodiment to the rear end of the pilot pipe. The figure which expands and shows the pipe | tube propulsion embedding apparatus of FIG. The longitudinal cross-sectional view which shows the state which carries out the embedment of a buried pipe by the pipe embedment propulsion apparatus of FIG. The longitudinal cross-sectional view which shows the state which carries out the propulsion embedding of a pilot pipe with the conventional pipe embedding propulsion apparatus. The longitudinal cross-sectional view which shows the state which embeds a buried pipe with the conventional pipe | tube embedding propulsion apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Propulsion machine 2 Bearing 3 Drive motor (rotation drive part)
4 Reducer (rotary drive)
5 Rotation drive member (Rotation drive part)
6 Large diameter hydraulic cylinder (propulsion part)
7 Promotion board (Promotion Department)
8 Small diameter hydraulic cylinder (pushing means)
DESCRIPTION OF SYMBOLS 9 Pilot pipe 9a Target 9b Tip inclined surface 9c Bearing 13 Casing 14 Buried pipe 15 Conventional pipe propulsion embedding apparatus 20 Pipe propulsion embedding apparatus 21 First embodiment Connection member 22 Thrust bearing 23 Output shaft (rotation drive means)
30 Pipe propulsion embedding device of the second embodiment 31 Auger head 31a Tip cutter 32 Tip conduit 33 Tip casing 34 Thrust bearing

Claims (4)

A pipe propulsion embedding device that embeds a pilot pipe in the ground from the inside of a vertical shaft dug on the surface,
A propulsion unit installed in the shaft, having a rotation driving unit for rotating the pilot pipe and a propulsion unit for propelling the pilot pipe into the ground;
A connecting member that is connected to the pilot pipe and is rotated and driven integrally with the pilot pipe;
A thrust bearing interposed between the connection member and the propulsion unit, which transmits a propulsive force from the propulsion unit to the connection member while allowing relative rotation of the connection member with respect to the propulsion unit;
A rotational driving force transmitting means for transmitting a rotational driving force from the rotational driving unit to the connection member;
A pipe propulsion embedding device characterized by comprising: The rotational driving force transmitting means is an output shaft whose rear end is connected to the rotational driving unit,
The connecting member is integrally fixed to the front end of the output shaft,
2. The pipe propulsion embedding device according to claim 1, wherein the thrust bearing is held by the connection member. A pipe propulsion embedding device that embeds a pipe by digging it into the ground from the inside of a vertical shaft dug on the surface,
A propulsion device installed in the shaft,
An auger screw having an auger head at its tip, which is connected to the rear end of a pilot pipe propelled in the ground by the propulsion unit and is integrally rotated by the rotation drive unit of the propulsion unit;
A cylindrical casing that is coaxially disposed around the auger screw and is propelled by a propulsion unit of the propulsion unit to discharge excavated soil excavated by the auger head;
A concentric pipe disposed at the front end of the casing and having a buried pipe continuous at the rear end;
The casing or the leading conduit allows the relative rotation of the auger head with respect to the casing and the leading conduit while transmitting the propulsive force received by the casing or the leading conduit from the propulsion unit of the propulsion device to the auger head. And a thrust bearing interposed between the auger head and
A pipe propulsion embedding device characterized by comprising: The thrust bearing is held by any of the auger head, the casing and the tip conduit;
In addition, a pushing means for projecting the auger head forward in the propulsion direction with respect to the casing is interposed between the propulsion unit of the propulsion unit and the rotation drive unit. Item 4. The pipe propulsion embedding device according to item 3.

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